USPTO Patents Application 09886083

55005573 A

Page 1 of 2

(19)

(11) Publication number:

55005573 A

Generated D oc u m e n t .

PATENT ABSTRACTS OF JAPAN

(21) Application number: 53079318

(22) Application date: 29.06.78

(51) Intl. CI.: H03H 9/64 H03H 9/10

(30) Priority:

(43) Date of application
publication:

(84) Designated contracting
states:

16.01.80

(71) Applicant: MATSUSHITA ELECTRIC IND CO

LTD

(72) Inventor: TSUKAMOTO KATSUHIDE

(74) Representative:

(54) SURFACE ACOUSTIC
WAVE FILTER

(57) Abstract:

PURPOSE: To eliminate the
unrequired signal by direct waves, by
locating the input and output
terminals connected respectively to
the transducers at the center and the
both sides, symmetrically with
respect to the center line.

CONSTITUTION: On the surface
acoustic wave filter chip 31 supported
on the base, the transducers 32, 33,
34 consisting of the crossing finger
electrodes are arranged transversally,
and the terminals 36 to 41 are
connected at their both poles. In this
case, the terminals of the transducers
33, 34 at the both sides and the
terminal of the transducer 44 at the
center are located so that they are not
asymmetrical to the center line of the
transducer 44 at the center to
eliminate the unnecessary signal by
the direct waves. For example, when
the terminals 36 and 39 are taken as
the input terminal and the terminals

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11/19/2002

Page 2 of 2

40 and 41 are taken as the output
terminal by connecting the
transducers 33 and 34 in series, the
unnecessary signal by the direct
waves is induced in phase at the
terminals 40 and 41 due to the
symmetry of constitution and it can
be rejected by the transformer 43.

COPYRIGHT: (C)1980,JPO&Japio

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11/19/2002

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